Home Categories Analytical Chemistry Isopentane
A9219314

Isopentane , 98% , 78-78-4

Synonym(s):
2-Methylbutane;Isopentane;iso-Pentane, Isopentane

CAS NO.:78-78-4

Empirical Formula: C5H12

Molecular Weight: 72.15

MDL number: MFCD00009338

EINECS: 201-142-8

Update time: 2022-07-08

PRODUCT Properties

Melting point: -160 °C
Boiling point: 30 °C(lit.)
Density  0.62 g/mL at 25 °C(lit.)
vapor density  2.6 (vs air)
vapor pressure  11.17 psi ( 20 °C)
refractive index  n20/D 1.354(lit.)
Flash point: −51 °C
storage temp.  2-8°C
solubility  0.048g/l
form  Liquid
pka >14 (Schwarzenbach et al., 1993)
color  Clear colorless
Odor gasoline-like odor
explosive limit 1.3-7.6%(V)
Odor Threshold 1.3ppm
Water Solubility  Miscible with water, hydrocarbons, oils, alcohol and ether.
λmax λ: 192 nm Amax: 1.00
λ: 210 nm Amax: 0.30
λ: 220 nm Amax: 0.07
λ: 240-400 nm Amax: 0.01
BRN  1730723
Henry's Law Constant (atm?m3/mol): 1.24 at 25 °C (approximate - calculated from water solubility and vapor pressure)
Exposure limits ACGIH TLV: TWA 600 ppm (adopted).
Dielectric constant 1.8(20℃)
Stability: Stable. Extremely flammable. Incompatible with strong oxidizing agents. Vapour-air mixtures explosive in certain proportions. Incompatible with rubber, various plastics. The vapour, being heavier than air, may roll over surfaces and collect in low points. Note low flash point.
LogP 3.4 at 20℃
CAS DataBase Reference 78-78-4(CAS DataBase Reference)
NIST Chemistry Reference Butane, 2-methyl-(78-78-4)
EPA Substance Registry System 2-Methylbutane (78-78-4)

Description and Uses

2-Methylbutane is used as a chemical intermediate. It acts as a blowing agent for polystyrene and gasoline additive. It is used as a solvent of polyethylene and involved in the preparation of polystyrene foam and polyurethane foam. Further, it is used in a closed loop in geothermal power production to operate turbines. In addition to this, it is used to freeze biological samples like tissues in place of dry ice for cryosectioning in histology.

Safety

Symbol(GHS) 
GHS02,GHS07,GHS08,GHS09
Signal word  Danger
Hazard statements  H224-H304-H336-H411
Precautionary statements  P210-P233-P273-P301+P310-P331-P403+P233
Hazard Codes  F+,Xn,N
Risk Statements  12-51/53-65-66-67
Safety Statements  9-16-29-33-61-62
RIDADR  UN 1265 3/PG 1
OEB A
OEL TWA: 120.0 ppm; 350.0 mg/m3, STEL: 610.0 ppm; 1800.0 mg/m3
WGK Germany  2
RTECS  EK4430000
Autoignition Temperature 788 °F
TSCA  Yes
HazardClass  3
PackingGroup  I
HS Code  29011000
Hazardous Substances Data 78-78-4(Hazardous Substances Data)

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